import time
incomplete_sign =50
print("="*23+'开始下载'+'='*25)
for i in range(incomplete_sign + 1):
    completed = "*"*i   #表示已完成
    incomplete ="."*(incomplete_sign-i)  #表示未完成
    percentage = (i/incomplete_sign)*100    #百分比
    print("\r{:.0f}%[{}{}]".format(percentage,completed,incomplete),end = "")
    time.sleep(0.5)
print("\n"+'='*23+'下载完成'+'='*25)